package nasif.cn.imagewikis.common.utils;

import java.io.UnsupportedEncodingException;
import java.security.spec.AlgorithmParameterSpec;
import java.security.spec.KeySpec;

import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;

import org.apache.commons.codec.binary.Base64;

public class DesEncrypter {

	Cipher ecipher;
	Cipher dcipher;

	byte[] salt = { (byte) 0xA9, (byte) 0x9B, (byte) 0xC8, (byte) 0x32,
			(byte) 0x56, (byte) 0x35, (byte) 0xE3, (byte) 0x03 };

	int iterationCount = 3;

	public DesEncrypter(String passPhrase) {

		try {
			KeySpec keySpec = new PBEKeySpec(passPhrase.toCharArray(), salt,
					iterationCount);
			SecretKey key = SecretKeyFactory.getInstance("PBEWithMD5AndDES")
					.generateSecret(keySpec);

			ecipher = Cipher.getInstance(key.getAlgorithm());
			dcipher = Cipher.getInstance(key.getAlgorithm());

			AlgorithmParameterSpec paramSpec = new PBEParameterSpec(salt,
					iterationCount);

			ecipher.init(Cipher.ENCRYPT_MODE, key, paramSpec);
			dcipher.init(Cipher.DECRYPT_MODE, key, paramSpec);
		} catch (Exception e) {
		}
	}

	public String encrypt(String str) {

		try {
			byte[] utf8 = str.getBytes("UTF8");
			byte[] enc = ecipher.doFinal(utf8);
			return new Base64().encode(enc).toString();
		} catch (javax.crypto.BadPaddingException e) {
		} catch (IllegalBlockSizeException e) {
		} catch (UnsupportedEncodingException e) {
		}

		return null;
	}

	public String decrypt(String str) {

		try {
			byte[] dec = new Base64().decode(str);
			byte[] utf8 = dcipher.doFinal(dec);
			return new String(utf8, "UTF8");
		} catch (javax.crypto.BadPaddingException e) {
		} catch (IllegalBlockSizeException e) {
		} catch (UnsupportedEncodingException e) {
		} 
		
		return null;
	}
}
